Suggest a valid method to analyse Cd and Cu levels in urine samples?

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

Would fecal samples stored at -20C for over a year impact metagenomic analysis?

Dear All, I have access to some rodent fecal samples that have been stored at -20C instead of -80C. Anyone have experience with the impact of stowage condition on comparative metagenomic analysis...

01 March 2021 2,512 1 View

Does different dilution factors affect negatively on NH3 reading ?

I have a sample of treated water sample & asked to obtain ammonia conc. in sample using a machine with 5-25 ppm detection range. However, upon testing with different dilution factors, all...

27 February 2021 8,483 3 View

How to compare 2 samples recruited with different sampling methods?

If I want to compare characteristics of 2 groups of patients, one group is recruited from a random sample of the general public while another group is from a sample with a fixed gender (male to...

26 February 2021 3,526 3 View

Can random sampling have inclusion criteria?

As random sampling means that everyone in the population have an equal chance to be chosen, can it have inclusion criteria? My research participants have been chosen based on the inclusion...

26 February 2021 6,905 10 View

Can the problems of overfitting be solved without cross validation?

For an overfit data set the cross validation error will be much bigger than the training error. Is it true or false?

23 February 2021 3,616 2 View

How to manage western blot for proteomics data validation?

Hi Everyone, I am a bigginer in western blotting and I am trying to use it for validation of my proteomics data. I have: two regulated proteins with molecular mass of 40 and 73 kDa one control...

23 February 2021 6,671 4 View

What is the best method to evaluate and measure non-circulating estrogen levels in mice ?

Could anyone suggest me the best procedure to measure the circulating estrogen levels in mice ? I came across the general methods where it can be measured in serum or urine but a detail suggestion...

22 February 2021 4,352 2 View

Do you consider undergoing a structure literature review / Meta analysis and getting numerical findings sort of quantitative method?

I am looking for a classification of the research methods included in literature review papers or Meta analysis ones .

22 February 2021 1,131 4 View

Can I do two kinds of mixed method in explanatory research?

Dear distinguish professors and scholars, I have a research in measuring two kinds: think tank capacity and research impact on policy. Can I do two kinds of mixed methods in order to find, "Is...

20 February 2021 6,897 1 View

Bruce Neagle

AAS or 'atomic absorption spectrometry'. See Perkin Elmer or Agilent websites.

Mark Krause

Certainly would be about the last method I'd recommend. Fraught with errors, even for an experienced analyst. First off, you'd be much happier with ICP-MS data. Secondly, AAS is not going to give you the kind of sensitivity you need, even with MIBK extraction and concentration. ICP-OES with an axial torch or, preferably, ICP-MS should be your methods of choice.

If you need to concentrate I'd look at using ion chromatography to perform the concentration step since you can use stacking to really concentrate the sample without much effort.